Hunan MTR Co., Ltd.
Hunan MTR Co., Ltd.
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0.15-0.25 Rigid Graphite Felt Shaped Pieces FOR Sintering Furnace
Features:
Material: Polyacrylonitrile
Category: Graphite Hard Felt
Product Type: Customize various specifications and sizes (customized by drawing)
Thermal conductivity: 0.15-0.25
Grade: A customized processing
Refractory temperature: above 2000 ℃
Core material: polyacrylonitrile
Form: Microporous
Graphite Felt Application:
1. Aerospace industry: hot isostatic pressing furnace, heat treatment, sintering, brazing, hot pressing furnace
2. Semiconductor industry: drawing silicon single crystal furnace, vacuum metallurgy
3. Metal heat treatment: heat treatment furnace, sintering furnace, brazing furnace
4. Carbon fiber production: induction heating or resistance heating carbonization furnace, graphitization furnace
5. The production of composite materials: pyrolytic carbon and pyrolytic graphite, chemical vapor deposition, or other composite materials
6. Energy materials: vanadium or other redox battery materials
Physical and chemical indicators:
| main material | PAN-CF / asphalt-CF / viscose-CF | Sheet specifications | length(mm) | 10-3000 |
| Bulk density(g/CM3)) | 0.22-0.28 | width(mm) | 10-2000 | |
| Thermal conductivity |
0.15-0.25(25℃)0.40-0.45(1400℃)
|
thickness(mm) | 5-300 | |
|
Barrel specifications |
diameter(Φ) | Φ100-Φ2500 | ||
| Carbon content(％) | ≧99 | Wall thickness(T) | 5-150 | |
| bending strength(Gpa) | 1.5-3.2 | Tube height | 100-3000 | |
| Flexural strength(Gpa) | 1.0-2.5 |
Use environment |
air(℃) | ≦350 |
| ash content(ppm) | ≦200 | vacuum(℃) | ≦2200 | |
| Processing temperature |
First ≧1800 Second≧2200 |
Inert atmosphere(℃) | ≦3000 |
Temperature resistance: 1800 ℃ in vacuum, 2850 ℃ in inert gas
Graphite Hard Felt has excellent ablation resistance, thermal shock resistance, airflow erosion resistance, and thermal insulation performance. It has the advantages of high rigidity, self-supporting, high strength, no short fiber drop, low thermal conductivity, and other advantages that traditional thermal insulation materials do not have.
Graphite hard felt (commonly known as carbon fiber composite hard felt, cured felt, carbon fiber-reinforced, etc.) is made by a special process that integrates graphite paper, polyacrylonitrile-based carbon felt, and polyacrylonitrile-based carbon cloth into one body, curing After molding, then primary and secondary high-temperature treatment.
Asphalt represented by Japan Kureha is the mainstream in the insulation industry. Insulation felts in Europe and the United States are basically based on viscose, while most of China uses polypropylene as the raw material. The process is to cut the polyacrylonitrile-based carbon felt or viscose-based carbon felt into the required size, roll it into a tube and put it into a container made of a graphite material, and place the graphite container in a high-temperature furnace (the high-temperature furnace is a graphite tube furnace, intermediate frequency, High-frequency induction furnace or other high-temperature furnaces with the heating method), with the protection of vacuum or high-purity inert gas, heating to 2200 ～ 2500 ℃ at a heating rate of 100 ～ 300 ℃ / h, then naturally cool to 100 ℃.